Removable caps for crusher hammer assembly

ABSTRACT

A hammer assembly for an impact rock crusher and the like has a bartype hammer provided with an interlocking joint portion, and a number of impact members sufficient to form a continuous impact surface on the hammer. Each impact member is provided with an interlocking joint structure for selectively interlocking with the joint portion of the hammer. Preferably, the joint structure is a flared tenon, and the joint portion is a flared mortise dimensioned to mate with the tenon and form a dovetail joint. Recesses are formed in the tenon for receiving portions of a bolt and nut assembly which retains the tenon in the mortise. By arranging the mortises to extend in a direction of movement of the hammer, the impact member will be biased toward a seated position during an impact thereon so that the bolt and nut will be relieved of strain.

United States Patent 1 1 Wallace et al.

[ REMOVABLE CAPS FOR CRUSHER HAMMER ASSEMBLY [75] Inventors: Joseph M. Wallace, Hialeah;

Emmett B. Street, Miami, both of Fla.

[73] Assignee: Capeletti Bros, Inc., Hialeah, Fla. [22] Filed: Sept. 27, 1972 21 Appl. No.; 292,733

[ 1 Oct. 1, 1974 Primary Exantiner-Granville Y. Custer, Jr. Assistant ExaminerHoward N. Goldberg Attorney, Agent, or Firm-Clarence A. OBrien; Harvey B. Jacobson [5 7 ABSTRACT A hammer assembly for an impact rock crusher and the like has a bartype hammer provided with an interlocking joint portion, and a number of impact members sufficient to form a continuous impact surface on the hammer. Each impact member is provided with an interlocking joint structure for selectively interlocking with the joint portion of the hammer. Preferably, the joint structure is a flared tenon, and the joint portion is a flared mortise dimensioned to mate with the tenon and form a dovetail joint. Recesses are formed in the tenon for receiving portions of a bolt and nut assembly which retains the tenon in the mortise. By arranging the mortises to extend in a direction of movement of the hammer, the impact member will be biased toward a seated position during an impact thereon so that the bolt and nut will be relieved of strain.

12 Claims, 9 Drawing Figures REMOVABLE CAPS FOR CRUSHER HAMMER ASSEMBLY BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates generally to a crusher hammer assembly, and in particular to a removable impact member or cap for bar-type hammers of impact rock crushers and the like.

2. Description of the Prior Art It is known to provide replaceable impact receiving inserts or caps on bar-type hammers used with impact rock crushers and the like. A typical example of the previously proposed arrangements for mounting these caps may be seen in US. Pat. No. 2,635,817, where the impact receiving members are guided by a tongue-andgroove arrangement extending the longitudinal length of the hammer bar and are retained in place by bolt and nut assemblies extending perpendicularly to the hammer bar. A drawback to this known arrangement, how

ever, is that the tongue and groove does not provide a sufficiently rigid seat for the impact members during an impact thereon, resulting in overstraining and frequent breakage of the bolt and nut assemblies.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hammer assembly particularly for impact rock crushers and the like, which has removable impact members mounted on the hammer in such a manner that an impact will tighten up the connection of the impact member and hammer and relieve stress and strain on a bolt and nut assembly retaining the impact member on the hammer.

It is another object of the present invention to provide a removable impact member for crusher hammers and the like which will tighten or seat against the hammer when subjected to an impact.

These and other objects are accomplished according to the present inventionby providing a crusher hammer assembly having a hammer member provided with an interlocking joint portion, and an impact member provided with an interlocking joint structure for selectively interlocking with the joint portion.

According to a preferred embodiment of the present invention, one of the interlocking joint structure and the interlocking joint portion is a flared tenon, and the other is a flared mortise dimensioned to mate with the flared tenon and form a dovetail joint. Advantageously, the interlocking joint structure of the impact member is the flared tenon, and the interlocking joint portion of the hammer member is the flared mortise.

By arranging the mortise to be extending in a direction parallel to a direction of movement of the hammer member, the impact member will be seated into the closed-end of the mortise during an impact thereon, thus releasing strain from a bolt and nut assembly retaining the impact member on the hammer member.

When the hammer member is a bar-type hammer arranged for being mounted on a rotor of an impact rock crusher and the like, it is advantageously provided with a plurality of mortises extending perpendicularly to the longitudinal extent of the hammer, and a plurality of impact members each having flared tenons arranged in the mortises for forming a continuous impact surface on the hammer member.

A removable impact member according to the present invention advantageously preferably has a flared tenon provided with walls which diverge outwardly from a body portion of a body member comprising the impact member. These walls join with an outer surface provided with a recess arranged extending parallel to the diverging walls and a further recess communicating with the one recess. These recesses are arranged for receiving a bolt shank and one of a bolt head and a nut. In this manner, the impact member is retained on the hammer member.

The impact member may have two legs arranged substantially L-shaped, and have the bolt head or nut receiving recess arranged at the junction of these legs.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof. wherein like numerals refer to like parts throughout.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. l is a perspective view showing a crusher rotor provided with hammer assemblies according to the present invention.

FIG.'2 is a fragmentary, sectional view taken generally along the line 2-2 of FIG. I.

FIG. 3 is a fragmentary, sectional view taken generally along the line 3-3 of FIG. 2.

FIG. 4 is a fragmentary, sectional view taken generally along the line 44 of FIG. 1.

FIG. 5 is an exploded, perspective view, with some parts removed, showing a hammer assembly according to the present invention.

FIG. 6 is a rear elevational view showing a removable impact member according to the present invention.

FIG. 7 is a side elevational view showing the impact member of FIG. 6.

FIG. 8 is a bottom plan view showing the impact member of FIGS. 6 and 7.

FIG. 9 is a perspective view showing the impact member of FIGS. 6 to 8.

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 of the drawings shows an impeller or rotor 10 mounted on a shaft 12 and provided with a pair of hammer assemblies l4, 16 according to the present invention. Rotor 10 is basically of a conventional type commonly used on, for example, impact rock crushers. It is to be understood that hammer assemblies l4, 16 may be used with other suitable types of crusher rollers and the like. Since assemblies l4, 16 are constructed in an identical manner, only assembly 14 will be discussed in detail below.

While two hammer assemblies 130 apart are shown in FIG. 1, other arrangements such as three assemblies apart could be employed as desired.

Referring now to FIGS. 2 to 5 of the drawings, a hammer assembly 14 has a'hammer member 18 provided with a first substantially planar surface 19 arranged facing outwardly transverse to a radial plane of rotor 10 and having a plurality of interlocking joint portions in the form of, for example, flared or double tapered wedge mortises 20, and associated impact members 22 are provided with interlocking joint structure 24 (FIG. 4) for selectively interlocking with the joint portion in forming a dovetail joint. For a bar-type hammer as illustrated, a number of members 22 are provided sufficient to cover the leading side of member 18 and form a continuous impact surface. A second substantially planar surface 25 extends obliquely from surface 19 and toward rotor and in a direction of rotation of rotor 10.

A pair of wedges 26, 28 connected together by for example, a rod 30 having screw-threaded end portions 32, 34 threadingly engaged by nuts 36, 38 are provided for selectively retaining a hammer member 18 on rotor 10. Hammer member 18 is provided with a doubleinclined projection 40 and a plurality of apertures 42 arranged for alignment with bores 43 provided in rotor 10. Wedges 26, 28 engage the inclined surfaces of projection 40 to hold member 18 in a keyed recess 44 provided in rotor 10. Bolts 46 are arranged in apertures 42 and bores 43, and nuts 48 are tightened down thereon to further rigidify member 18 in recess 44.

FIGS. 6 to 9 show a preferred embodiment of impact member 22 according to the present invention. Interlocking joint structure 24 is for example, a flared or double-tapered wedge tenon 50 having walls 52, 54 diverging outwardly from a body portion of a body member 56 comprising member 22 to join an outer surface 58 provided with a recess 60 extending parallel to walls 52, 54. A further recess 62 is arranged communicating with recess 60. Body member 56 has two legs 64, 66 covering the leading side and top of member 18 and arranged substantially L-shaped, and recess 62 is arranged at the junction of these legs 64, 66. Leg 64 forms the body portion from which tenon 50 extends.

A bolt 68 (FIG. 5) has a shank 70 arrangeable in recess 60, and a head 72 attached to shank 70. A nut 74 is arrangeable in recess 62 for retention thereby in the axial direction of shank 70. Alternatively, head 72 may be arranged in recess 62.

As can best be seen from FIG. 5, member 18 has on planar surface 19 a longitudinally extending, projecting portion 76 forming a wall 78 arranged enclosing an end of mortises 20. This wall 78 is provided with an opening 80 in each mortise for bolt 68 to pass through.

By having the mortises 20 arranged extending perpendicularly from portion 76 in a direction of movement of member 18, as indicated by the arrow in FIG. 1, they cooperate with tenons 50 for seating the impact members 18 during an impact thereon and relieving strain from the bolt 68.

Impact members 22 may be used with all standard crushers, subject to suitable modification of the hammers.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention.

What is claimed as new is as follows:

1. A hammer assembly for a crusher, comprising, in combination:

a. a hammer member arranged for being mounted on a rotor of a crusher, and provided with a first substantially planar surface arranged facing outwardly transverse to a radial plane of the associated rotor,

a second substantially planar surface extending obliquely from the first surface toward the associated rotor and in a direction of rotation of the rotor, and a projecting portion forming a wall arranged extending transverse to the direction of rotation of the associated rotor and radially outwardly from the first surface along an edge thereof spaced from the second surface;

b. an interlocking joint portion provided on the first surface and arranged extending perpendicularly from the wall to the second surface;

0. an impact member having a pair of joined legs arranged forming a substantially L-shaped body portion; and

d. an interlocking joint means provided on the body portion for removably interlocking with the joint portion, an outside surface of one leg of the body member arranged forming an impact surface for the hammer assembly.

2. A structure as defined in claim 1, wherein one of the interlocking joint means and the interlocking joint portion is a flared tenon and the other is a flared mortise dimensioned to mate with the flared tenon and form a dovetail joint.

3. A structure as defined in claim 2, wherein the interlocking joint means is the flared tenon, and the interlocking joint portion is the flared mortise.

4. A structure as defined in claim 3, wherein the wall is arranged enclosing an end of the flared mortise and provided with an opening, and further including means arranged in the opening for retaining the tenon in the mortise.

5. A structure as defined in claim 4, wherein the flared tenon has walls which diverge outwardly from the body portion and join with an outer surface provided with a recess for receiving the retaining means.

6. A structure as defined in claim 5, wherein the re taining means is a headed bolt and nut, and a further recess is provided in said outer surface and arranged at the junction of the impact member legs in communication with the recess for receiving one of the bolt head and the nut.

7. A structure as defined in claim 6, wherein the hammer member is provided with a plurality of flared mortises, and a plurality of impact members are arranged in the mortises for forming a continuous impact surface on the hammer member.

8. A structure as defined in claim 7, wherein the hammer member is a bar-type hammer having a longitudinal extent and arranged for mounting on the rotor of the impact rock crusher, and the projecting portion extends longitudinally of the hammer member, with the mortises arranged extending perpendicularly from the projecting portion in a direction of movement of the hammer member for cooperating with the tenons and seating the impact members during an impact thereon and relieving strain from the associated retaining means.

9. A structure as defined in claim 8, further including a pair of wedges connected together by a rod having screw-threaded end portions and nuts threadingly engaging the end portions, and wherein the hammer member is provided with a projection arranged for cooperating with the wedges and with at least one aperture for receiving a bolt, the wedges and bolt selectively retaining the hammer member in a recess provided in the crusher rotor.

H). A structure as defined in claim 1, wherein the hammer member is a bar-type hammer having a longitudinal extent and arranged for being mounted on the 11. A removable impact member for a crusher hammer, comprising a body member having a pair of legs arranged substantially L-shaped, one of the legs forming an impact surface and interlocking joint means provided on the other of the legs for selectively interlocking with a mating interlocking joint portion provided on an associated crusher hammer member, the interlocking joint means being a flared tenon having walls which diverge outwardly from a body portion of the body member and joint with an outer surface provided with a recess arranged extending parallel to the diverging walls and a further recess arranged at the juncture of the body member legs for communicating with said recess, said recess and further recess arranged for respectively receiving a bolt shank and one of a bolt head and a nut.

12. A structure as defined in claim 9, further including the rotor, wherein said rotor is provided with means for mounting the hammer member. 

1. A hammer assembly for a crusher, comprising, in combination: a. a hammer member arranged for being mounted on a rotor of a crusher, and provided with a first substantially planar surface arranged facing outwardly transverse to a radial plane of the associated rotor, a second substantially planar surface extending obliquely from the first surface toward the associated rotor and in a direction of rotation of the rotor, and a projecting portion forming a wall arranged extending transverse to the direction of rotation of the associated rotor and radially outwardly from the first surface along an edge thereof spaced from the second surface; b. an interlocking joint portion provided on the first surface and arranged extending perpendicularly from the wall to the second surface; c. an impact member having a pair of joined legs arranged forming a substantially L-shaped body portion; and d. an interlocking joint means provided on the body portion for removably interlocking with the joint portion, an outside surface of one leg of the body member arranged forming an impact surface for the hammer assembly.
 2. A structure as defined in claim 1, wherein one of the interlocking joint means and the interlocking joint portion is a flared tenon and the other is a flared mortise dimensioned to mate with the flared tenon and form a dovetail joint.
 3. A structure as defined in claim 2, wherein the interlocking joint means is the flared tenon, and the interlocking joint portion is the flared mortise.
 4. A structure as defined in claim 3, wherein the wall is arranged enclosing an end of the flared mortise and provided with an opening, and further including means arranged in the opening for retaining the tenon in the mortise.
 5. A structure as defined in claim 4, wherein the flared tenon has walls which diverge outwardly from the body portion and join with an outer surface provided with a recess for receiving the retaining means.
 6. A structure as defined in claim 5, wherein the retaining means is a headed bolt and nut, and a further recess is provided in said outer surface and arranged at the junction of the impact member legs in communication with the recess for receiving one of the bolt head and the nut.
 7. A structure as defined in claim 6, wherein the hammer member is provided with a plurality of flared mortises, and a plurality of impact members are arranged in the mortises for forming a continuous impact surface on the hammer member.
 8. A structure as defined in claim 7, wherein the hammer member is a bar-type hammer having a longitudinal extent and arranged for mounting on the rotor of the impact rock crusher, and the projecting portion extends longitudinally of the hammer member, with the mortises arranged extending perpendicularly from the projecting portion in a direction of movement of the hammer member for cooperating with the tenons and seating the impact members during an impact thereon and relieving strain from the associated retaining means.
 9. A structure as defined in claim 8, further including a pair of wedges connected together by a rod having screw-threaded end portions and nuts threadingly engaging the end portions, and wherein the hammer member is provided with a projection arranged for cooperating with the wedges and with at least one aperture for receiving a bolt, the wedges and bolt selectively retaining the hammer member in a recess provided in the crusher rotor.
 10. A structure as defined in claim 1, wherein the hammer member is a bar-type hammer having a longitudinal extent and arranged for being mounted on the rotor of a crusher and is provided with a plurality of interlocking joint portions, and wherein a plurality of impact members is provided, each having interlocking joint means arranged in the interlocking joint portions for forming a continuous impact surface on the hammer surface.
 11. A removable impact member for a crusher hammer, comprising a body member having a pair of legs arranged substantially L-shaped, one of the legs forming an impact surface and interlocking joint means provided on the other of the legs for selectively interlocking with a mating interlocking joint portion provided on an associated crusher hammer member, the interlocking joint means being a flared tenon having walls which diverge outwardly from a body portion of the body member and joint with an outer surface provided with a recess arranged extending parallel to the diverging walls and a further recess arranged at the juncture of the body member legs for communicating with said recess, said recess and further recess arranged for respectively receiving a bolt shank and one of a bolt head and a nut.
 12. A structure as defined in claim 9, further including the rotor, wherein said rotor is provided with means for mounting the hammer member. 